Elevator safety device.



M. NESZTOR.

ELEVATOR SAFETY DEVICE.

APPLIOATION FILED OOT.11, 1911.

2 SHEETS+SHEET l.

WITNESSES ATTORNEYS Patented June 4, 1912.

M. NESZTOR.

ELEVATOR SAFETY DEVICE. APPLIIOATIONQIILBD 01. 11, 1911.

1,028,594, Patented June4, 1912.

2 SHEETSSHEBIT z.

WITNESSES MIHALY NESZTOR, OF HARTFORD, WISCONSIN.

ELEVATOR SAFETY DEVICE.

Specification of Letters Patent.

Patented June 4, 1912.

AppIication filed October 11, 1911. Serial No. 654,027.

To all whom it may concern:

Be it known that I, MIHALY NEsz'roR, a subjectof the King of Hungary,residing at Hartford, in the county of Washington and State ofWisconsin, have invented certain new and useful Improvements in ElevatorSafety Devices, of which the following is a specification, referencebeing had therein to the accompanying'drawing.

This invention relates to an elevator safety device especially designedfor large freight elevators or the elevators of mines employed forhauling pit cars from a mine to the top of a shaft.

The primary object of my invention is to furnish an elevator cage withpositive and reliable means, in a manner as will be hereinafter setforth, for gripping the guides of the elevator cage and preventing asudden descent of the cage when the hoisting cable or cables thereofbreak or become accidentally disconnected from the hoisting drum or thetop of the cage.

A further object of this invention is to provide a safety device that isautomatic in its action, durable and highly eflicient for the purposesfor which it is intended.

WVith the above and other objects in view, the invention resides in thenovel construction, combination and arrangement of parts to behereinafter specifically described and then claimed. 7

Reference will now be had to the drawings, wherein like numerals denotecorresponding parts throughout the several views, in which:

Figure 1 is a side elevation of an elevator safety device in accordancewith this invention, Fig. 2 is a vertical longitudinal sectional view ofthe same, Fig. 3 is a vertical cross sectional view of the elevatorsafety device, Fig. 4 is an enlarged longitudinal sectional view of aportion of the safety device, and Figs. 5 and 6 are detail perspectiveviews of parts of the device.

The reference numerals 1 denote vertical guides and these guides,adjacent to the lower ends thereof, are connected. by a rec'- tangularframe. 2 having straps 3, adjacent to the guides, provided with inwardlyprojecting lugs 4. The lugs 4 are in the path of the guide grippingmembers, whereby said members will be thrown outwardly when the elevatorcage is at rest at the bottom of the shaft. The elements 2 to 4inclusive are only used when the hoisting cable .of the cage is slackwith the cage at the bottom and hold the elevator cage,

of a mine shaft, said lugs holding the guide gripping members wherebythe hoisting cable can be made taut and the cage elevated between theguides.

The cage comprises A-shaped frames having central vertical plates 5,angularly disposed legs 6, heads 7 and a-platform 8 supported by saidlegs and the center plates 5. The platform 8 is built up of structuralsteel and the sides thereof are provided with angle bars 9 looselyengaging the sides of the guides 1 to assist in guiding the cage betweensaid guides. The platform 8 is provided with longitudinal angle rails 10constituting a track to receive pit cars or trucks, and to prevent a caror truckfrom becoming displaced during the movement of the elevatorcage, the legs 6 are provided with gates. These gates are in the form oflongitudinal rods 11 frictionallyheld in bearings 12 carried by theinner sides of the legs 6. One end of each rod is bent outwardly, as at18 to form a gate and the opposite end of each rod is bent, as at 14 toengage one of the legs 6 and limit the downward movement of the gate,the gates in a closed position being horizontal and when in an openposition the gates are swung upwardly in proximity to the upper ends ofthe legs 6.

The outer sides of the heads 7 are provided with channel bars 15cooperating with the angle bars 9 in guiding the cage between theguides 1. The confronting sides of the heads 7 are provided with sets ofangle bars 16 and arranged between said angle bars is a cross headcomprising channel bars 17 Located centrally of the cross head is abearing plate 18 havinga central opening 19 for a coupling pin 20. Thecoupling pin 20 has the upper end thereof provided with an eye 21 andconnected to said eye is the lower end of a hoisting cable 22. Thecoupling pin'20, adjacent to the eye 21, has oppositely disposed sets ofapertured lugs 23 and pivotally mounted between said lugs by pins 24 arethe upper ends of curved links 25. The lower ends of the curved linksare pivotally connected by pins 26 to cranks 27 mounted upon transverseshafts 28, journaled in the heads 7. The outer ends of the shafts 28 areprovided with serrated, toothed or roughened gripping members 29. havinghooks 30. The gripping members 29 are adapted to frictionally grip theguides 1 when the cable thereof is displaced. The hooks 30 are n tlopiesof this patent may be obtained for five cents each, by addressing theadapted to engage the lugs 4, for the purpose previously mentioned.

The lower end of the pin 20 extends through an opening 31 providedtherefor in a guide plate 32 secured to the under side of the channelbars 17. The lower end of the pin 20 is reduced to provide a screwthreaded stem 33 and retained upon said stem by a nut 34 is a cup 35.Encircling the pin 20, between the cup 35 and the guide plate 32, is acoiled compression spring 36 and the object of this spring is toimmediately lower the pin 20 relatively to the cross head when thehoisting cable 22 becomes displaced. Surrounding the spring 36 and thelower end of the pin 20 is a cage or skeleton frame 37 that is suspendedfrom the flanges of the channel bars 17. Associated with the cranks 27are looking members 38 having the ends thereof bifurcated, with thelower ends apertuned and pivotally mounted upon the ends of the pins 26.The upper bifurcated ends of said members are provided with. teeth 39and these teeth are adapted to engage angle stops 40 mounted upon thebearing plate 18, also keepers 41 movably mounted upon the upper ends oftie rods 42 connecting the bearing plate 18 and the guide plate 32. Theupper ends of the tie rods 42 are encircled by coiled compressionsprings 43 that bearupon the keepers 41, said-springs being retainedunder tension by nuts 44 mounted upon the upper ends of said tie rods.The outer ends of the keepers are notched, as at 45 to receive thetoothed ends of the locking members 38 and the upperends of the anglestops are notched, as at 46 for the same purpose.

In the operation of the elevator safety device, the spring 36immediately lowers the pin 20 relatively to the angle bars 17, when thecable 22 is displaced, and such. movement of the pin 20 causes the links25 to push downwardly upon the cranks 27, partially rotate the shafts 28and swing the gripping members 29 into engagement with the guides 1. Asthe outer ends of the cranks 27 move downwardly, the locking members 38are pulled outwardly and are held by the angle stops 40 and the keepers41, thus preventing the cranks 27 from. assuming their normal positionafter the gripping members 29 have been thrown into engagement with theguides 1. The gripping members are locked in their adjusted position andcan be only released by manual elevation of the keepers 41 and thelocking members 38. Then the cable 22 can be repaired and the pin 20restored to its normal position to swing the gripping members out ofengagement with the guides.

What I claim is 1. In an elevator safety device, the combination withguides, a rectangular frame carried thereby adjacent to the lower endsof said guides and provided with inwardly projecting lugs, a hoistingcable, and a cage slidably mounted between said guides and comprisingA-shaped side frames having heads, of a cross head connecting saidheads, a spring actuated pin arranged centrally of said cross head andadapted to be supported by the hoisting cable, shafts journaled in theheads of said frames, gripping members carried by the outer ends of saidshafts and adapted to frictionally engage said guides, hooks carried bysaid gripping members and adapted to engage the lugs of saidrectangiilar frame for moving said gripping members out of engagementwith said guides when said hoisting cable is slack, and connectionsbetween said shafts and said spring actuated pin for moving saidgripping members into engagement with said guides when the hoistingcable of said pin is displaced.

2. In an elevator safety device, the combination with guides, carriedthereby adjacent to the lower ends of said guides and provided withinwardly projecting lugs, a hoisting cable, and a cage slidably mountedbetween said guides and comprising A-shaped side frames having heads, ofa cross head connecting said heads, a spring actuated pin arrangedcent-rally of said cross head and adapted to be supported by thehoisting cable, shafts journaled in the heads of said frames, grippingmembers carried by the outer ends of saidshafts and adapted tofrictionally engage said guides, hooks carried by said gripping membersand adapted to engagethe lugs of said rectangular frame, for moving saidgripping members out of engagement with said guides when said hoistingcable is slack, connections between said shafts and said spring actuatedpin for moving said gripping members into engagement with said guideswhen the hoisting cable of said pin is displaced, and means actuated bya movement of said shafts and including locking members and springpressed keepers for retaining said shafts in an adjusted position withthe gripping members thereof in engagement with said guides.

In testimony whereof I afiix my signature in the presence of twowitnesses.

MIHALY NESZTOR.

Witnesses-z V STEVE MEsnARosoT, J. H. SGHNORENBERG.

Commissioner of Patents,

Washington, I). G.

a rectangular frame

